CN102347855A - Method, device and network equipment for realizing bidirectional forwarding detection - Google Patents
Method, device and network equipment for realizing bidirectional forwarding detection Download PDFInfo
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Abstract
The invention discloses a method, a device and network equipment for realizing bidirectional forwarding detection. The method comprises the steps of: dividing a plurality of sessions to be subjected to bidirectional forwarding detection into session groups with a set number, and polling each session sub-group according to a set polling period; specific to each session in the currently polled session sub-group, performing the following steps of: sending a keep-alive message to opposite-end equipment of each session and judging whether the keep-alive message sent by the opposite-end equipment is received or not in a set detection period; if the judgment is negative, determining that the corresponding session is in connectivity fault; or else, determining that the corresponding session is free of connectivity fault. According to the method disclosed by the invention, all the sessions do not need to be polled at the same time, so that the occupancy amount of a CPU (Central Processing Unit) is reduced and the system forwarding performance is increased.
Description
Technical field
The present invention relates to network communications technology field, refer to a kind of two-way forwarding detection implementation method, device and network equipment that is applicable to many sessions especially.
Background technology
Two-way forwarding detects that (Bidirectional Forwarding Detection BFD) provides a kind of light load, short network failure of duration to detect, so that can set up replaceable channel faster or be switched to other links when breaking down.The principle that BFD detects is: periodically send the keep-alive message to the opposite end between two equipment of link to be detected; And the keep-alive message of detection opposite end transmission; When losing the message of the opposite end transmission of setting quantity continuously; Think link occurs fault; And cancel corresponding route through Routing Protocol, arrive the purpose that switches to backup link.
In the prior art, use a system architecture that BFD detects the session connectedness as shown in Figure 1, this system comprises: the city's row equipment that is connected with province row equipment; Second line of a couplet router in city's row equipment, bottom can connect the first line of a couplet router of some sites.As shown in Figure 1, for example: second line of a couplet router RJ-C and RJ-D bottom be connected respectively RJ-1 ... and the first line of a couplet router of some sites such as RJ-N.
In order to guarantee the professional normal operation in site, each site generally all is connected on city's row second line of a couplet router through two mutually redundant links.The main line bandwidth is generally big than the backup link bandwidth, occurs forward-path to be switched to spare line apace under the unusual situation at main line, and when main line recovered, forward-path can switch back main line, thereby can utilize the high bandwidth of main line.As shown in Figure 1; The first line of a couplet router of whole city bank outlets is through multi-service transport platform (the Multi-Service Transfer Platform of 10M; MSTP) (Frame Relay, FR) circuit connects the second line of a couplet RJ-C and the RJ-D router of city's row for circuit and 2M frame relay.Wherein, the MSTP circuit is as master (Master) forward-path, and the FR circuit is as being equipped with (Backup) forward-path.Operation BFD protocol detection MSTP link when BFD detects link failure, is cancelled the route on the MSTP circuit through Routing Protocol, thereby is reached the purpose that switches to backup link between site first line of a couplet router and the city's row second line of a couplet router.
For can fast detecting link fault and switch, generally at present adopt BFD and Routing Protocol interlock, BFD is other agreement of Millisecond, can fast detecting to the line link switching of going forward side by side of the fault of link, make client traffic minimum break period.For the site router, its BFD session only 1 tunnel.And for city's row second line of a couplet router, its site reaches hundreds of, and its BFD session number also is hundreds of.For detecting link validity promptly and accurately; Conventional method is to start a high priority timer; Every 10ms traversal detects a BFD session; Judge that whether current sessions need send the keep-alive message and confirm according to whether receiving the keep-alive message that sends the opposite end whether session is overtime to the opposite end, overtimely promptly think link failure.
This mode need be stored in the BFD session information in the bigger array, and the session of every road takies the space of an element of data.As shown in Figure 2, be the sketch map of BFD session information in the prior art, wherein, MAX_SESSION_SIZE is the heap(ed) capacity of array, and CURRENT_SESSION_SIZE is in esse number of sessions.Each cycle of timer need be to all session polls once; Carry out whether need sending the keep-alive message one by one and whether session is overtime; Like this for city's row second line of a couplet router; Because the site router that connects is a lot; For detecting link accurately, the session that when each timer expires, need travel through is many.Thereby cause existing following problem:
(1) since the task of timer of high priority can preferentially be processed when starting; And the session of the task of timer of this high priority traversal is a lot; All the session meetings of each traversal take a large amount of cpu resources, can cause relatively low service message of other priority or BFD message dropping simultaneously.
(2) the BFD session possibly exist synchronously on the second line of a couplet router; Promptly sending the keep-alive message to the opposite end carries out with the keep-alive message that receives the opposite end transmission simultaneously; The BFD session takes place when synchronous in high-volume conversation simultaneously, can cause bursts of traffic, possibly cause BFD to lose message or service message is lost.
Wherein, losing of service message can cause data re-transmission, and network is more congested; Abandoning of BFD message can cause the BFD concussion; Thereby cause judging by accident link failure; Link is frequently switched; Therefore; Existing BFD detects implementation method and can cause the router forwarding performance to reduce; For the business that professional real-time is had relatively high expectations, forwarding performance is low, link frequently switches is flagrant.
Summary of the invention
The embodiment of the invention provides a kind of two-way forwarding detection implementation method, device and the network equipment, in order to solve the problem that has the router forwarding performance reduction of regularly many sessions being carried out taking a large amount of cpu resources when BFD detects and can causing in the prior art.
A kind of two-way forwarding detects implementation method, comprising:
A plurality of sessions of needs being carried out two-way forwarding detection are divided into the conversation group that sets quantity, according to each conversation of polling cycle poll of setting; The following step is carried out in each session in the conversation of current poll:
Opposite equip. to said session sends the keep-alive message, and judges in the sense cycle of setting, whether to receive the keep-alive message that opposite equip. sends;
When being judged as not, confirm that there is failure of connectivity in said session; Otherwise confirm that there is not failure of connectivity in said session.
A kind of two-way forwarding detects implement device, comprising:
Grouping module is used for that needs are carried out a plurality of sessions that two-way forwarding detects and is divided into the conversation group that sets quantity;
The poll module is used for according to each conversation of polling cycle poll of setting;
Detection module, be used for each session execution the following step to the conversation of current poll: the opposite equip. to said session sends the keep-alive message, and judges in the sense cycle of setting, whether to receive the keep-alive message that opposite equip. sends; When being judged as not, confirm that there is failure of connectivity in said session; Otherwise confirm that there is not failure of connectivity in said session.
A kind of network equipment comprises that above-mentioned two-way forwarding detects implement device.
Beneficial effect of the present invention is following:
The two-way forwarding that the embodiment of the invention provides detects implementation method, device and the network equipment, and a plurality of sessions of needs being carried out two-way forwarding detection are divided into the conversation group that sets quantity, according to each conversation of polling cycle poll of setting; To each session in the conversation of current poll; Carry out two-way forwarding detection and determine whether to exist failure of connectivity; This method is all sessions of poll simultaneously; Also need not carry out the judgement that whether need send the keep-alive message to each session; Send the step that the keep-alive message is given opposite equip. but expire to carry out at timer; This method can reduce the quantity and the number of times of the session of calling when realizing all session messages detections; Thereby reduced the CPU occupancy, improved the system forwards performance; The possibility that has reduced loss of data and abandoned, thus avoided the erroneous judgement link that link failure caused frequently to switch phenomenon, can be good at satisfying the instructions for use of real time business.
Description of drawings
Fig. 1 is the network system architecture figure that uses BFD mechanism in the prior art;
Fig. 2 is a BFD session information sketch map in the prior art;
Fig. 3 is the flow chart that two-way forwarding detects implementation method in the embodiment of the invention;
Fig. 4 is a BFD session information sketch map in the embodiment of the invention;
Fig. 5 is the structural representation that two-way forwarding detects implement device in the embodiment of the invention.
Embodiment
Can cause the system forwards performance to reduce to two-way forwarding testing mechanism in the prior art; Influence the transmission of data message; The problem that causes forward delay interval or abandon; The embodiment of the invention provides a kind of two-way forwarding to detect implementation method; A plurality of sessions are divided into groups; A group session is detected, each group of poll realizes the two-way forwarding of many sessions is detected successively at every turn.This method flow comprises the steps: as shown in Figure 3
Step S11: a plurality of sessions of needs being carried out two-way forwarding detection are divided into the conversation group that sets quantity.
When new session is set up, newly-established session is dispensed in advance in the selected conversation in the conversation of the setting quantity of setting up.Preferably, the selected session identification number according to newly-established session of conversation is confirmed.
Preferably,, can set the quantity and the polling cycle of conversation, make and to distinguish each conversation of poll in the transmission cycle once at a keep-alive message according to the transmission cycle of sending the keep-alive message to opposite equip. in order to obtain more excellent detection effect.
For example: according to the characteristic of BFD session, each road inter-dialog gap 50ms need send a keep-alive message and detect its connectedness.For message can be in time sent in each road session, system start-up one timer, every interval 10ms call BFD and handle function, are used to discern each road session and whether need send the keep-alive message and receive whether receive time-out of the keep-alive message that sends the opposite end.For all sessions, only need in the 50ms to send a keep-alive message and detect receive time-out one time.For the timer of 10ms, can detect all sessions 5 times in the 50ms, need all sessions of traversal to find out the session that needs to send the keep-alive message at every turn, cause the cpu resource waste.If directly use 50ms at interval timer could cause all session status synchronous, cause other resource consumption of CPU and system burst to occur and cause system unstable.So this characteristic that detects based on BFD among the present invention; The BFD session that all are to be detected is divided into 5 groups; Timer uses 10ms timer at interval; Only handle one group during each timer expiry; All sessions all are to need to send the keep-alive message just in this group and be provided with; Do not need to detect again and whether need send the keep-alive message, and other untreated group thought it all is not reach send to require, need not to judge the waste resource.For each group session, its processing time is M*50+ (x-1) * 10ms (M=0,1,2......, an expression wrap count;=1,2,3,4,5, x represents group number), to handle blanking time be the time span 50ms that a session need be sent a keep-alive message just for each group session like this.
As shown in Figure 4, being the BFD information sketch map that a plurality of sessions is divided into 5 groups, is example with the system shown in scheming, the individual site of the RJ-C second line of a couplet 360 (N=360) in this system, and the router startup BFD of RJ-C and 360 sites detects link separately.For RJ-C; It need set up 360 tunnel sessions simultaneously; BFD detects for this 360 tunnel session being carried out effectively; Avoid its concussion simultaneously; With its be divided into as shown in Figure 4 five groups: Group1 ...; Group5; Each session branch is at random gone in the conversation group; Wherein MAX_GROUP_SESSION_SIZE is the maximum quantity of the session that each conversation group supported; CURRENT_SESSION_SIZE is the number of sessions that comprises in the current sessions group, and span is 1 to MAX_GROUP_SESSION_SIZE.
Preferably; When conversation selected confirmed according to the session identification number of newly-established session; Specifically can be: after site router RJ-N starts; RJ-C sets up corresponding with it BFD session BFD N; BFDN can be a random value that obtains; As session identification number, obtain a group according to algorithm group=(random%5+1).Wherein random%5 representes to get N divided by remainder after 5.For example determining group is 3, and BFD N is added into a free space in this conversation group of Group3, and will reorganize CURRENT_SESSION_SIZE and add 1.If session number actual in this group has reached MAX_GROUP_SESSION_SIZE, check then whether next group exists this session of free space storage in being the 4th group, and the like, till finding free space.In addition, also can realize choosing a conversation, for example: hash algorithm etc. through other algorithms according to session identification number.
Certainly be a kind of optional mode according to the selected conversation of session identification number; In fact also any one conversation of selection that can be at random or select each conversation to add session successively according to the order of poll; For example add for the first time Group1 to; Add for the second time Group2 to; ... or the like, as long as the session number in the conversation of selecting does not reach maximum MAX_GROUP_SESSION_SIZE.
Above-mentioned is that example describes to be divided into five groups, can handle under the condition that be the session needs time span of sending a keep-alive message blanking time just satisfying each group session in the practical application, reasonably is divided into some groups.
After setting up, the BFD session starts fast detecting, with this road BFD session Random assignment to a certain conversation group.If the session in a certain conversation group reaches the maximum capacity of this conversation group, then it is divided into next group, until finding the suitable conversation group that free space is arranged, add session to find conversation group, store the information of this session.
Step S12: according to each conversation of polling cycle poll of setting.
Confirm the quantity and setting polling cycle of conversation according to the transmission cycle of sending the keep-alive message to opposite equip..Generally make the product of polling cycle of quantity and setting of conversation equal to send the transmission cycle of keep-alive message, can obtain best poll effect to opposite equip..
Continue to use the example of top, when system start-up first via BFD session, timer brings into operation.After each timer time arrived, function was handled in system call BFD session, handled the group session in the conversation group according to current state, and the group sequence number of recording conversation group, and timer lower whorl circulation time is handled the group session in the next conversation group.That is: (during 0ms) handled first group session (session among the Group of conversation group 1) when timer started; (during 10ms) handles second group session (session among the Group of conversation group 2) when first 10ms arrives ... (during 40ms) handles the 5th group session (session among the Group of conversation group 5) when the 4th 10ms arrives; (during 50ms) is again since first group session the 5th 10ms arrival the time.The time interval that every group session is handled is 50 milliseconds just, reaches the demand that its 50ms sends message and detects packet loss.
When the product of the polling cycle of the quantity of conversation and setting is not equal to the transmission during cycle of sending the keep-alive message to opposite equip., also can realize poll.For example: at the keep-alive message of 50ms in the transmission cycle; Every at a distance from conversation of 8ms poll; After intact 5 conversation of poll; Wait for the arrival of next 50ms; This mode equals to send to opposite equip. transmission cycle of keep-alive message unlike the product of the polling cycle of the quantity of conversation and setting, can obtain best poll effect.But also can solve the problem of the router forwarding performance reduction of regularly many sessions being carried out taking a large amount of cpu resources when BFD detects in the prior art and can causing.
Step S13: the following step is carried out in each session in the conversation of current poll.
Conversation of so each poll, each timer expires and only handles each session in the conversation, and thinks that these sessions need send the keep-alive message simultaneously.
Step S14: the opposite equip. of the session in the conversation of current poll sends the keep-alive message.
Step S15: the keep-alive message of judging the opposite equip. transmission that in the sense cycle of setting, whether receives this session.
When being judged as when being execution in step S16; Otherwise, execution in step S17.
Send the transmission cycle of keep-alive message according to opposite equip. and set sense cycle, wherein, sense cycle is the setting multiple that opposite equip. sends the transmission cycle of keep-alive message.Sense cycle generally can be set be 3 times of transmission cycle that opposite equip. sends the keep-alive message, can not receive the keep-alive message that send the opposite end promptly continuous three times, think this session failure.
Step S16: confirm that there is not failure of connectivity in this session.
If in sense cycle, can receive the keep-alive message that send the opposite end, it is connective good to think that this session exists, and does not have fault.
Step S17: confirm that there is failure of connectivity in this session.
If in sense cycle, fail to receive the keep-alive message that send the opposite end, promptly the session receive time-out thinks that there is failure of connectivity in this session.
Preferably, above-mentioned steps S17 confirms that said session exists after the failure of connectivity, also comprises:
Step S18: will exist the session of failure of connectivity from the conversation at place, to delete.
When a certain road BFD session timeout needs this session is deleted from conversation.
Step S19: the position in conversation of other sessions in the adjustment conversation makes the position of other sessions in conversation continuous.
Preferably, when a certain road BFD session timeout need be deleted this session from conversation, in the respective session group, stay vacancy.In order to keep the continuous row of conversation recording in the conversation group, last session in this group is moved to the position of this session of having deleted, every group of BFD session handled in the continuous space, avoid the timer processing null session, waste CPU.
Can certainly not take last session in this group is moved to the position of this session of having deleted; And take the session mode of prerequisite in turn after will the session of deletion; Realization makes the position of other sessions in conversation continuous, and the number of sessions that this mode moves is more relatively.
With each conversation group shown in Figure 4 is example; Wherein, The second tunnel session BFDX is detected and has the connectivity of link fault in Group 1 this conversation group; Whether this session this moment no longer need send the keep-alive message and detect the keep-alive message that receives the opposite end transmission overtime, needs the information of this session of deletion in conversation group.Then, give last road session in this conversation group with this session occupation space, promptly session BFD Y takies, and CURRENT_SESSION_SIZE subtracted 1 in should organizing, and session BFD Y recovers initialization in shared space.
The situation that is divided into 5 groups for above-mentioned 360 tunnel sessions; The actual session number is recorded in this and organizes among the corresponding CURRENT_SESSION_SIZE in each group; During its all sessions are stored in the continuous space; Each timer arrives and only needs successively from continuous space, this array front, to read information and send message, reduces unnecessary judgement.Reduction is to the utilization rate of CPU.
The two-way forwarding that provides based on the embodiment of the invention detects implementation method; The embodiment of the invention also provides a kind of two-way forwarding to detect implement device; This device can be arranged on any need carrying out in the network equipment of two-way forwarding detection many sessions; The structure of this device comprises as shown in Figure 5: grouping module 10, poll module 20 and detection module 30.
Grouping module 10 is used for that needs are carried out a plurality of sessions that two-way forwarding detects and is divided into the conversation group that sets quantity.
Preferably; Above-mentioned grouping module 10 specifically is used for: when new session is set up, newly-established session is dispensed in advance in the selected conversation in the conversation of the setting quantity of setting up; Wherein, the selected session identification number according to newly-established session of conversation is confirmed.
Poll module 20 is used for according to each conversation of polling cycle poll of setting.
Detection module 30, be used for each session execution the following step to the conversation of current poll: the opposite equip. to session sends the keep-alive message, and judges in the sense cycle of setting, whether to receive the keep-alive message that opposite equip. sends; When being judged as not, confirm that there is failure of connectivity in this session; Otherwise confirm that there is not failure of connectivity in this session.
Preferably; Above-mentioned detection module 30; Also be used for: confirm that session exists after the failure of connectivity; Delete from the conversation at place there being the session of failure of connectivity; And the position in conversation of other sessions in the adjustment conversation, make the position of other sessions in conversation continuous.
Preferably, above-mentioned two-way forwarding detects implement device, also comprises:
Module 40 is set, and the keep-alive message transmission cycle that is used for sending according to opposite equip. is set sense cycle, and wherein, sense cycle is that the keep-alive message that opposite equip. sends sends the setting multiple in cycle.
Preferably; The above-mentioned module 40 that is provided with; Also be used for setting according to the transmission cycle of sending the keep-alive message to opposite equip. the quantity and the polling cycle of conversation, wherein, the quantity of conversation and the product of polling cycle equal to send to opposite equip. the transmission cycle of keep-alive message.
The two-way forwarding that provides based on the embodiment of the invention detects implementation method, and the embodiment of the invention also provides a kind of network equipment, comprises that above-mentioned two-way forwarding detects implement device.Wherein the network equipment can comprise router, switch etc.
The above-mentioned two-way forwarding that the embodiment of the invention provides detects implementation method and device; Detect through many sessions being carried out the branch group polling; This detection of packets; Session in group of each poll gets final product; The all sessions of frequent poll have been avoided; When not influencing the BFD measuring ability, will be reduced to minimum to the utilization rate of CPU.Simultaneously; Can avoid the BFD of multichannel session to detect the bursts of traffic that transmitting-receiving causes synchronously; The link flapping that the link erroneous judgement of avoiding session status to bring is synchronously caused has also reduced the influence to the service message of low priority, has reduced the possibility of loss of data and service disconnection.
Said method is for the convergence device with numerous second line of a couplet equipment (like first line of a couplet router of each site among Fig. 1) (like the second line of a couplet router of city's row among Fig. 1); In the effect aspect the forwarding performance raising is fairly obvious; Through the session smoothing processing of dividing into groups to BFD; Promptly can fast detecting arrive the link failure of session; In time switch to backup link; Can reduce service disconnection again, avoid losing of data.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (11)
1. a two-way forwarding detects implementation method, it is characterized in that, comprising:
A plurality of sessions of needs being carried out two-way forwarding detection are divided into the conversation group that sets quantity, according to each conversation of polling cycle poll of setting; The following step is carried out in each session in the conversation of current poll:
Opposite equip. to said session sends the keep-alive message, and judges in the sense cycle of setting, whether to receive the keep-alive message that opposite equip. sends;
When being judged as not, confirm that there is failure of connectivity in said session; Otherwise confirm that there is not failure of connectivity in said session.
2. the method for claim 1 is characterized in that, saidly needs are carried out a plurality of sessions that two-way forwarding detects is divided into the conversation group that sets quantity, specifically comprises:
When new session is set up, newly-established session is dispensed in advance in the selected conversation in the conversation of the setting quantity of setting up, wherein, the selected session identification number according to newly-established session of conversation is confirmed.
3. the method for claim 1 is characterized in that, according to the keep-alive message transmission cycle setting sense cycle that opposite equip. sends, said sense cycle is the setting multiple in said transmission cycle.
4. the method for claim 1; It is characterized in that; According to quantity from said conversation to the transmission cycle of opposite equip. transmission keep-alive message and the polling cycle of setting, wherein, the quantity of said conversation and the product of polling cycle equal the said transmission cycle.
5. like the arbitrary described method of claim 1-4, it is characterized in that, confirm that said session exists after the failure of connectivity, also comprises:
To exist the said session of failure of connectivity from the conversation at place, to delete, and the position of other sessions in conversation be continuous in the adjustment conversation.
6. a two-way forwarding detects implement device, it is characterized in that, comprising:
Grouping module is used for that needs are carried out a plurality of sessions that two-way forwarding detects and is divided into the conversation group that sets quantity;
The poll module is used for according to each conversation of polling cycle poll of setting;
Detection module, be used for each session execution the following step to the conversation of current poll: the opposite equip. to said session sends the keep-alive message, and judges in the sense cycle of setting, whether to receive the keep-alive message that opposite equip. sends; When being judged as not, confirm that there is failure of connectivity in said session; Otherwise confirm that there is not failure of connectivity in said session.
7. device as claimed in claim 6; It is characterized in that; Said grouping module; Specifically be used for when new session is set up; Newly-established session is dispensed in advance in the selected conversation in the conversation of the setting quantity of setting up; Wherein, the selected session identification number according to newly-established session of conversation is confirmed.
8. device as claimed in claim 6 is characterized in that, also comprises:
Module is set, and the keep-alive message transmission cycle that is used for sending according to opposite equip. is set sense cycle, and said sense cycle is the setting multiple in said transmission cycle.
9. device as claimed in claim 6 is characterized in that, also comprises:
Module is set, is used for setting according to the transmission cycle of sending the keep-alive message to opposite equip. the quantity and the polling cycle of said conversation, wherein, the quantity of said conversation and the product of polling cycle equal the said transmission cycle.
10. like the arbitrary described device of claim 6-9; It is characterized in that; Said detection module; Be used for also confirming that said session exists after the failure of connectivity; Delete from the conversation at place there being the said session of failure of connectivity; And the position in conversation of other sessions in the adjustment conversation, make the position of other sessions in conversation continuous.
11. a network equipment is characterized in that, comprises that arbitrary described two-way forwarding detects implement device like claim 6-10.
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